Very interesting map with respect to its price. Against it by default has a large, food is on the card and the USB plug is poorly filtered. This means that about a dozen machines and two cards US-122L tested the problem is the same: the audio quality depends on the signal quality of aliments from the USB port 5V. Therefore result cetain mac or PC there are whistles that full agreement on a certian PC hum, etc ... I'm looking for a USB power filter, the inverter 220 is not enough because the power of the PC redégrade signal.

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